Preview:
<div class="input-group small-input-button">
    <button class="btn btn-outline-secondary" type="button">Small</button>
    <input type="text">
</div>
<div class="input-group">
    <button class="btn btn-outline-secondary" type="button">default</button>
    <input type="text">
</div>
<div class="input-group large-input-button">
    <button class="btn btn-outline-secondary" type="button">Large</button>
    <input type="text">
</div>
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